Abstract
This study was carried out to determine some physiological and phenological responses of the bean under high [CO2] and drought stress. The experiment was conducted from April to July 2009 in Viçosa, Brazil. The open-top chambers were used to enrich the air with CO2, whereas the drought stress was applied between the flowering and the ripening. The randomized block design was used, with four replicates in the subplots. The following plots were [CO2] at 700ppm (F1) and [CO2] environmental (F2) and the subplots were well watering (S1) and drought stress (S2). The results were subjected to Anova and the Tukey test (P < 0.05). For the treatments F1S1 and F1S2 the photosynthetic rate showed increments of 59% and the transpiration reduction of 12%. The yield, leaf temperature and stomatal conductance were not significant different to high [CO2], different from the dry matter, who showed increment of 20% (F1S1) and the water use efficiency who showed increase of 90% for high [CO2]. The osmotic potential was lower in plants under drought stress (F2S2 and F1S2), followed by plants under high [CO2] (F1S1). Despite the increment in photosynthesis, high [CO2] does not guarantee higher yield.
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Claims 8
Claim · model-written summary
Elevated CO2 increased bean photosynthetic rate by 59% in watered and drought treatments.
Verbatim
e0“For the treatments F1S1 and F1S2 the photosynthetic rate showed increments of 59%”
t0“bean crop”
e1“[CO2] at 700ppm (F1) and [CO2] environmental (F2)”
Claim · model-written summary
Elevated CO2 reduced bean transpiration by 12% in watered and drought treatments.
Verbatim
e0“For the treatments F1S1 and F1S2 the photosynthetic rate showed increments of 59% and the transpiration reduction of 12%.”
t0“bean crop”
e1“[CO2] at 700ppm (F1) and [CO2] environmental (F2)”
Claim · model-written summary
High CO2 did not significantly change bean yield.
Not reportedComparatorDirection
Verbatim
e0“The yield, leaf temperature and stomatal conductance were not significant different to high [CO2]”
t0“bean crop”
Claim · model-written summary
High CO2 did not significantly change bean leaf temperature.
Not reportedComparatorDirection
Verbatim
e0“The yield, leaf temperature and stomatal conductance were not significant different to high [CO2]”
t0“bean crop”
Claim · model-written summary
High CO2 did not significantly change bean stomatal conductance.
Not reportedComparatorDirection
Verbatim
e0“The yield, leaf temperature and stomatal conductance were not significant different to high [CO2]”
t0“bean crop”
Claim · model-written summary
High CO2 under well watering increased bean dry matter by 20%.
Verbatim
e0“dry matter, who showed increment of 20% (F1S1)”
t0“bean crop”
e1“[CO2] at 700ppm (F1) and [CO2] environmental (F2)”
Claim · model-written summary
High CO2 increased bean water use efficiency by 90%.
Not reportedComparator
Verbatim
e0“water use efficiency who showed increase of 90% for high [CO2]”
t0“bean crop”
Claim · model-written summary
Bean osmotic potential was lower under drought than in the high CO2 well watered treatment.
Verbatim
e0“The osmotic potential was lower in plants under drought stress (F2S2 and F1S2), followed by plants under high [CO2] (F1S1).”
t0“bean crop”
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